Maybe this is just me, but in most of my games (especially chained/adjacent forts) maybe 80-90% of my fortification moves include all my armies on one territory moving to another. So when it prompts you for how many armies you want to fortify, it should assume you want to move all your armies, not just one. You can move it down as easily as you move up, but in my experience, you fort with more armies more often than less. Since a) this would make things a bit easier, as you don't need to scroll down to your correct number of armies, which gets a bit repetitive and b) some of the more enlightened among us can remember the desired number wrong, repeatedly, which can only lead to anger and the general throwing of things.

So, instead of automatically setting the number of armies when you click on a country to fort from to one, why not make it all the armies, akin to when you advance armies after an attack?

Priority: 2 - (non-essential, but should increase ease while not being very difficult to do)

Oh, and I'm assuming this has already been suggested, but I searched and couldn;t find it. Thanks.